DESCENT X50i Owner’s Manual

Viewing the Surface Interval App

The surface interval app shows your nitrogen (N2) and helium (He) tissue load level, current oxygen toxicity units (OTU), and central nervous system (CNS) percentage.

NOTE: The OTU accumulated during a dive expire after 24 hours.

  1. Select SI.

Green: 0 to 79% tissue load.

Yellow: 80 to 99% tissue load.

Red: 100% or greater tissue load.

Green: 0 to 249 OTU.

Yellow: 250 to 299 OTU.

Red: 300 or greater OTU.

Green: 0 to 79% CNS oxygen toxicity.

Yellow: 80 to 99% CNS oxygen toxicity.

Red: 100% or greater CNS oxygen toxicity.
  1. Press NEXT to view your no-fly time remaining and the time of day the no-fly period ends.